https://www.reuters.com/article/us-usa-sec-spacs-analysis/as-u-s-watchdog-steps-up-scrutiny-grab-deal-signals-blank-check-party-peak-idUSKBN2C125Z >WASHINGTON/NEW YORK (Reuters) -While the blank-check deals market reached new heights this week with Grab Holdings' record $40 billion merger, some lawyers and regulatory experts said the exuberance was unlikely to last as the U.S. securities watchdog steps up scrutiny of such deals.